Final answer:
To change management, investors with combined shares over 50% are required, which can be achieved by investors 1, 2, and 3 together in this case. Investors 1 and 2 together hold significant influence but not absolute control as they lack a majority.
Step-by-step explanation:
The question about the minimum number of directors for a newly incorporated company is a business-related inquiry, specifically pertaining to corporate governance and company law. However, the provided information regards the voting power of shareholders in an existing company, which can help us understand how decisions like changing the company's top management can be made based on shareholder votes. To answer the question provided in the information: To change the company's top management, more than 50% of the voting shares must agree. Therefore, the minimum number of investors needed would be the smallest group whose combined shares exceed 50,000. Adding up the shares from the largest shareholders, investors 1, 2, and 3, we get a total of 53,000 shares, which is enough to constitute a majority and thus change the management. If investors 1 and 2, who hold a combined total of 38,000 shares (20,000 + 18,000), vote together, they would have significant influence but not an absolute certainty of control, as they do not reach the 50,001 share majority on their own.